If you need to reinstall Windows XP and only have the original disk you are in for a long process to get the operating system installed and up to date. There have been hundreds, if not thousands of security patches and updates released for Windows XP since its release in 2001. So, you could install XP with the original disk, then install the latest service pack and updates, but you may run into problems such as the fact that the original XP doesn’t recognize all of your large hard disk. The best way to reduce installation time and avoid potential problems is to "slipstream" the service pack files into the original version of XP. What you end up with is an installation media with all the service pack files already included.